It's a shame the article has nothing to say about how, if at all, they determined that the pigs were not conscious. Was it speculation or a PET scan that was compared to a live pig PET? Not much to consider without knowing more about the results.
Religion aside, the question of "what is death?" seems a little appropriate because of the very real possibility that a piece of donated gray matter could contain some important part of the donor's memory or personality that a living brain could access. Would such a hybrid brain reflect the consciousness of both people?
I've always wondered whether consciousness is a program running as software rather than built into the hardware, and whether cognition can ever go to zero and be restored. Interrupt it by going to zero brain activity and the pattern is lost, like turning on a computer without the boot disk. If the program of consciousness shuts down, then there is no real way to restart it by simple stimulation, and there will be no awareness.
In the case of cold water suspension, I imagine the brain doesn't ever shut down completely and a certain critical minimum of firing is maintained.
To bring this full circle, the reason I was asking these inappropriate questions about souls is to discuss whether a soul could be another way of describing that operating system actively running in RAM. (Or "ghost" in the parlance of Ghost in the Shell.)